# 附录\*能愿动词

为了避免歧义，文档大量使用了「能愿动词」，对应的解释如下：

* `必须 (MUST)`：绝对，严格遵循，请照做，无条件遵守；
* `一定不可 (MUST NOT)`：禁令，严令禁止；
* `应该 (SHOULD)`：强烈建议这样做，但是不强求；
* `不该 (SHOULD NOT)`：强烈不建议这样做，但是不强求；
* `可以 (MAY)`和`可选 (OPTIONAL)`：选择性高一点，在这个文档内，此词语使用较少；


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